Croatia first appeared as a duchy in the late 8th century and then as a kingdom in the 10th century. From the 12th century it remained a distinct state with its ruler (ban) and parliament, but it obeyed the kings and emperors of various neighboring powers, primarily Hungary and Austria.

The period from the 15th to the 17th centuries was marked by bitter struggles with the Ottoman Empire. After being incorporated in Yugoslavia for most of the 20th century, Croatia regained independence in 1991.

Dalmatia was the northern part[7] of the Illyrian kingdom between the 4th century BC until the Illyrian Wars in the 220s BC and 168 BC when the Roman Republic established its protectorate south of the river Neretva. The area north of the Neretva was slowly incorporated into Roman possession until the province of Illyricum was formally established c. 32–27 BC.

The Dalmatia region then became part of the Roman province of Illyricum. Between 6 and 9 AD the Dalmatians raised the last in a series of revolts together with the Pannonians, but it was finally crushed and in 10 AD Illyricum was split into two provinces, Pannonia and Dalmatia. The province of Dalmatia spread inland to cover all of the Dinaric Alps and most of the eastern Adriatic coast. Dalmatia was the birthplace of the Roman Emperor Diocletian, who, upon retirement from Emperor in AD 305, built a large palace near Salona, out of which the city of Split later developed.[8][9]

Historians such as Theodore Mommsen and Bernard Bavant argue that all Dalmatia was fully romanized and Latin speaking by the 4th century.[citation needed] Others, such as Aleksandar Stipčević, argue that the process of romanization was rather selective and involved mostly urban centers but not the countryside, where previous Illyrian socio-political structures were adapted to Roman administration and political structure only in some necessities.[10]

The Roman period ends with Avar and Croat invasions in the 6th and 7th centuries and the destruction of almost all Roman towns. Roman survivors retreated to more favourable sites on the coast, islands and mountains.[12] The city of Ragusa was founded by such survivors from Epidaurum.[13]

The Frankish overlordship ended during the reign of Mislav two decades later.[16] According to the Constantine VII christianization of Croats began in the 7th century, but the claim is disputed and generally christianization is associated with the 9th century.[17] In 879, under duke Branimir, the duke of Croats, Dalmatian Croatia received papal recognition as a state from Pope John VIII.[18]

Tomislav was the first ruler of Croatia who was styled a king in a letter from the Pope John X, dating kingdom of Croatia to year 925. Tomislav defeated Hungarian and Bulgarian invasions, spreading the influence of Croatian kings.[19]

The consequences of the change to the Hungarian king included the introduction of feudalism and the rise of the native noble families such as Frankopan and Šubić. The later kings sought to restore some of their previously lost influence by giving certain privileges to the towns. For the next four centuries, the Kingdom of Croatia was ruled by the Sabor (parliament) and a Ban (viceroy) appointed by the king.[22]

The princes of Bribir from the Šubić family became particularly influential, asserting control over large parts of Dalmatia, Slavonia and Bosnia. Later, however, the Angevins intervened and restored royal power. The period saw rise of native nobility such as the Frankopans and the Šubićs to prominence and ultimately numerous Bans from the two families.[23]

Separate coronation as King of Croatia was gradually allowed to fall into abeyance and last crowned king is Charles Robert in 1301 after which Croatia contented herself with a separate diploma inaugurale. The reign of Louis the Great (1342–1382) is considered the golden age of Croatian medieval history.[24]Ladislaus of Naples also sold the whole of Dalmatia to Venice in 1409. The period saw increasing threat of Ottoman conquest and struggle against the Republic of Venice for control of coastal areas. The Venetians gained control over most of Dalmatia by 1428. With exception of the city-state of Dubrovnik which became independent,[25] the rule of Venice on most of Dalmatia will last nearly four centuries (c. 1420 – 1797).

In 1490 the estates of Croatia declined to recognize Vladislaus II until he had taken oath to respect their liberties, and insisted upon his erasing from the diploma certain phrases which seemed to reduce Croatia to the rank of a mere province. The dispute was solved in 1492[26]

Croatia in Habsburg Monarchy (1527–1918), Ottoman Empire (1493–1699) and fall of the Republic of Venice (1797)[edit]

As the Turkish incursion into Europe started, Croatia once again became a border area. The Croats fought an increasing number of battles and gradually lost increasing swaths of territory to the Ottoman Empire. Ottoman conquests led to the 1493 Battle of Krbava field and 1526 Battle of Mohács, both ending in decisive Ottoman victories. King Louis II died at Mohács, and in 1527, the Hungarian parliament elected János Szapolyai as the new king of Hungary. Another Hungarian parliament elected Ferdinand Habsburg as King of Hungary. On the other side, the Croatian Parliament met in Cetin and choseFerdinand I of the House of Habsburg as new ruler of Croatia, under the condition that he provide protection to Croatia against the Ottoman Empire while respecting its political rights.[22][25][26] A few years later both crown would be again united in Habsburgs hands and the union would be restored. The Ottoman Empire further expanded in the 16th century to include most of Slavonia, western Bosnia (then called Turkish Croatia) and Lika. Ottoman Croatia initially was part of Rumelia Eyalet, laterly was parts of Budin Eyalet, Bosnia Eyalet and Kanije Eyalet.

Later in the same century, Croatia was so weak that its parliament authorized Ferdinand Habsburg to carve out large areas of Croatia and Slavonia adjacent to the Ottoman Empire for the creation of the Military Frontier (Vojna Krajina, German: Militaergrenze) which would be ruled directly from Vienna's military headquarters.[27] The area became rather deserted and was subsequently settled by Serbs, Vlachs, Croats and Germans and others. As a result of their compulsory military service to the Habsburg Empire during conflict with the Ottoman Empire, the population in the Military Frontier was free of serfdom and enjoyed much political autonomy, unlike the population living in the parts ruled by Hungary.

After the Bihać fort finally fell in 1592, only small parts of Croatia remained unconquered. The Ottoman army was successfully repelled for the first time on the territory of Croatia following the battle of Sisak in 1593. The lost territory was partially restored, except for large parts of today's Bosnia and Herzegovina, Lika and Slavonia regions of present Croatia.

With the fall of the Venetian Republic in 1797, its possessions in eastern Adriatic became subject to a dispute between France and Austria. The Habsburgs eventually secured them (by 1815) and Dalmatia and Istria became part of the empire, though they were in Cisleithania while Croatia and Slavonia were under Hungary.

Shortly before the end of the First World War in 1918, the Croatian Parliament severed relations with Austria-Hungary as the Entente armies defeated those of the Habsburgs. Croatia and Slavonia became a part of the State of Slovenes, Croats and Serbs composed out of all Southern Slavic territories of the now former Austro-Hungarian Monarchy with a transitional government headed in Zagreb. Although the state inherited much of Austro-Hungary's military arsenal, including the entire fleet, the Kingdom of Italy moved rapidly to annex the state's most western territories, promised to her by the Treaty of London of 1915.

The Kingdom underwent a crucial change in 1921 to the dismay of Croatia's largest political party, the Croatian Peasant Party (Hrvatska seljačka stranka). The new constitution abolished the historical/political entities, including Croatia and Slavonia, centralizing authority in the capital of Belgrade. The Croatian Peasant Party boycotted the government of the Serbian People's Radical Party throughout the period, except for a brief interlude between 1925 and 1927, when external Italian expansionism was at hand with her allies, Albania, Hungary, Romania and Bulgaria that threatened Yugoslavia as a whole.

In the early 1920s the Yugoslav government of Serbian prime minister Nikola Pasic used police pressure over voters and ethnic minorities, confiscation of opposition pamphlets[28] and other measures of election rigging to keep the opposition, and mainly the Croatian Peasant Party and its allies in minority in Yugoslav parliament.[29] Pasic believed that Yugoslavia should be as centralized as possible, creating in place of distinct regional governments and identities a Greater Serbian national concept of concentrated power in the hands of Belgrade.[30]

During a Parliament session in 1928, the Croatian Peasant Party's leader Stjepan Radić was mortally wounded by Puniša Račić, a deputy of the Serbian Radical People's Party, which caused further upsets among the Croatian elite. In 1929, King Aleksandar proclaimed a dictatorship and imposed a new constitution which, among other things, renamed the country the Kingdom of Yugoslavia. Political parties were banned from the start and the royal dictatorship took on an increasingly harsh character. Vladko Maček, who had succeeded Radić as leader of the Croatian Peasant Party, the largest political party in Croatia, was imprisoned, and members of a newly emerging insurgent movement, the Ustaše, went into exile. According to the British historian Misha Glenny the murder in March 1929 of Toni Schlegel, editor of a pro-Yugoslavian newspaper Novosti, brought a "furious response" from the regime. In Lika and west Herzegovina in particular, which he described as "hotbeds of Croatian separatism," he wrote that the majority-Serb police acted "with no restraining authority whatsoever."[31]

In the words of a prominent Croatian writer, Shlegel's death became the pretext for terror in all forms. Politics was soon "indistinguishable from gangsterism."[32] Even in this oppressive climate, few rallied to the Ustaša cause and the movement was never able to organise within Croatia. But its leaders did manage to convince the Communist Party that it was a progressive movement. The party's newspaper Proleter (December 1932) stated: "[We] salute the Ustaša movement of the peasants of Lika and Dalmatia and fully support them."

In 1934, King Aleksandar was assassinated abroad, in Marseille, by a coalition of the Ustaše and a similarly radical movement, the Bulgarian VMORO. The Serbian-CroatianCvetković-Maček government that came to power, distanced Yugoslavia's former allies of France and the United Kingdom, and moved closer to Fascist Italy and Nazi Germany in the period of 1935–1941. A national Banovina of Croatia was created in 1939 out of the two Banates, as well as parts of the Zeta, Vrbas, Drina and Danube Banates. It had a reconstructed Croatian Parliament which would choose a Croatian Ban and Viceban. This Croatia included a part of Bosnia, most of Herzegovina and the city of Dubrovnik and the surroundings.

The anti-fascist communist-led Partisan movement, based on pan-Yugoslav ideology, emerged in early 1941, under the command of Croatian-born Josip Broz Tito, spreading quickly into many parts of Yugoslavia. The 1st Sisak Partisan Detachment, often hailed as the first armed anti-fascist resistance unit in occupied Europe, was formed in Croatia, in the Brezovica Forest near the town of Sisak. As the movement began to gain popularity, the Partisans gained strength from Croats, Bosniaks, Serbs, Slovenes, and Macedonians who believed in a unified, but federal, Yugoslav state.

By 1943, the Partisan resistance movement had gained the upper hand, against the odds, and in 1945, with help from the Soviet Red Army (passing only through small parts such as Vojvodina), expelled the Axis forces and local supporters. The ZAVNOH, state anti-fascist council of people's liberation of Croatia, functioned since 1942 and formed an interim civil government by 1943. NDH's ministers of War and Internal Security Mladen Lorković and Ante Vokić tried to switch to Allied side. Pavelić was in the beginning supporting them but when he found that he would need to leave his position he imprisoned them in Lepoglava prison where they were executed.

Following the defeat of the Independent State of Croatia at the end of the war, a large number of Ustaše, civilians supporting them (ranging from sympathizers, young conscripts, anti-communists, and ordinary serfs who were motivated by Partisan atrocities), Chetniks and anti-Communists attempted to flee in the direction of Austria hoping to surrender to British forces and to be given refuge. They were instead interned by British forces and then returned to the Partisans. A large number of these persons were killed in what has come to be called the Bleiburg tragedy.

Croatia was a Socialist Republic part of a six-part Socialist Federative Republic of Yugoslavia. Under the new communist system, privately owned factories and estates were nationalized, and the economy was based on a type of planned market socialism. The country underwent a rebuilding process, recovered from World War II, went through industrialization and started developing tourism.

The country's socialist system also provided free apartments from big companies, which with the workers' self-management investments paid for the living spaces. From 1963, the citizens of Yugoslavia were allowed to travel to almost any country because of the neutral politics. No visas were required to travel to eastern or western countries, or to capitalist or communist nations.[36]

Such free travel was unheard of at the time in the Eastern Bloc countries, and in some western countries as well (e.g., Spain or Portugal, both dictatorships at the time). This proved to be very helpful for Croatia's inhabitants who found working in foreign countries more financially rewarding. Upon retirement, a popular plan was to return to live in Croatia (then Yugoslavia) to buy a more expensive property.

In Yugoslavia, the people of Croatia were guaranteed free healthcare, free dental care, and secure pensions. The older generation found this very comforting as pensions would sometimes exceed their former paychecks. Free trade and travel within the country also helped Croatian industries that imported and exported throughout all the former republics.

Students and military personnel were encouraged to visit other republics to learn more about the country, and all levels of education, especially secondary education and higher education, were free. In reality the housing was inferior with poor heat and plumbing, the medical care often lacking even in availability of antibiotics, schools were propaganda machines and travel was a necessity to provide the country with hard currency. The propagandists, who want people to believe "neutral policies" equalized Serbs and Croats, severely restricted free speech and did not protect citizens from ethnic attacks.

Membership in the party was as much a prerequisite for admission to colleges and for government jobs as in the Soviet Union under Joseph Stalin or Nikita Krushchev. Private sector businesses did not grow as the taxes on private enterprise were often prohibitive. Inexperienced management sometimes ruled policy and controlled decisions by brute force. Strikes were forbidden, owners/managers were not permitted to make changes or decision which would impact their productivity or profit.

The economy developed into a type of socialism called samoupravljanje (self-management), in which workers controlled socially owned enterprises. This kind of market socialism created significantly better economic conditions than in the Eastern Bloc countries. Croatia went through intensive industrialization in the 1960s and 1970s with industrial output increasing several-fold and with Zagreb surpassing Belgrade for the amount of industry. Factories and other organizations were often named after Partisans who were declared national heroes. This practice also spread to street names, names of parks and buildings, and some more trivial features.

Before World War II, Croatia's industry was not significant, with the vast majority of the people employed in agriculture. By 1991 the country was completely transformed into a modern industrialized state. By the same time, the Croatian Adriatic coast had taken shape as an internationally popular tourist destination, all coastal republics (but mostly SR Croatia) profited greatly from this, as tourist numbers reached levels still unsurpassed in modern Croatia. The government brought unprecedented economic and industrial growth, high levels of social security and a very low crime rate. The country completely recovered from WWII and achieved a very high GDP and economic growth rate, significantly higher than those of the present-day republic.

The constitution of 1963 balanced the power in the country between the Croats and the Serbs and alleviated imbalance coming from the fact that the Croats were again in a minority position. Trends after 1965 (like the fall of OZNA and UDBA chief Aleksandar Ranković from power in 1966),[37] however, led to the Croatian Spring of 1970–71, when students in Zagreb organized demonstrations to achieve greater civil liberties and greater Croatian autonomy. The regime stifled the public protest and incarcerated the leaders, but this led to the ratification of a new constitution in 1974, giving more rights to the individual republics.

At that time, radical Ustaše cells of Croatian émigrés in Western Europe[38] planned and carried out guerilla acts inside Yugoslavia, but they were largely countered.[39]

In 1980, after Tito's death, economic, political, and religious difficulties started to mount and the federal government began to crumble. The crisis in Kosovo and, in 1986, the emergence of Slobodan Milošević in Serbia provoked a very negative reaction in Croatia and Slovenia; politicians from both republics feared that his motives would threaten their republics' autonomy. With the climate of change throughout Eastern Europe during the 1980s, the communist hegemony was challenged (at the same time, the Milošević government began to gradually concentrate Yugoslav power in Serbia and calls for free multi-party elections were becoming louder.[40]

In June 1989 the Croatian Democratic Union (HDZ) was founded by Croatian nationalist dissidents led by Franjo Tuđman, a former fighter in Tito's Partisan movement and JNA General. At this time Yugoslavia was still a one-party state and open manifestations of Croatian nationalism were dangerous so a new party was founded in an almost conspiratorial manner. It was only on 13 December 1989 that the governing League of Communists of Croatia agreed to legalize opposition political parties and hold free elections in the spring of 1990.[40]

On 22 April and 7 May 1990, the first free multi-party elections were held in Croatia. Franjo Tuđman's Croatian Democratic Union (HDZ) won by a 42% margin against Ivica Račan's reformed communist Party of Democratic Change (SDP) who won 26%. However, Croatia's first-past-the-post election system enabled Tuđman to form the government relatively independently as the win translated into 205 mandates (out of 351 total). The HDZ's intentions were to secure independence for Croatia, contrary to the wishes of a part of the ethnic Serbs in the republic, and federal politicians in Belgrade. The excessively polarized climate soon escalated into complete estrangement between the two nations and spiralled into sectarian violence.

On 25 July 1990, a Serbian Assembly was established in Srb, north of Knin, as the political representation of the Serbian people in Croatia. The Serbian Assembly declared "sovereignty and autonomy of the Serb people in Croatia".[41] Their position was that if Croatia could secede from Yugoslavia, then the Serbs could secede from Croatia. Milan Babić, a dentist from the southern town of Knin, was elected president. The rebel Croatian Serbs established a number of paramilitary militias under the leadership of Milan Martić, the police chief in Knin.

On 17 August 1990, the Serbs began what became known as the Log Revolution, where barricades of logs were placed across roads throughout the South as an expression of their secession from Croatia. This effectively cut Croatia in two, separating the coastal region of Dalmatia from the rest of the country. The Croatian government responded to the blockade of roads by sending special police teams in helicopters to the scene, but they were intercepted by SFR Yugoslav Air Force fighter jets and forced to turn back to Zagreb.

The Croatian constitution was passed in December 1990 categorizing Serbs as a minority group along with other ethnic groups. Babić's administration announced the creation of a Serbian Autonomous Oblast of Krajina (or SAO Krajina) on 21 December 1990. Other Serb-dominated communities in eastern Croatia announced that they would also join SAO Krajina and ceased paying taxes to the Zagreb government.

On Easter Sunday, 31 March 1991, the first fatal clashes occurred when Croatian police from the Croatian Ministry of the Interior (MUP) entered the Plitvice Lakes national park to expel rebel Serb forces. Serb paramilitaries ambushed a bus carrying Croatian police into the national park on the road north of Korenica, sparking a day-long gun battle between the two sides. During the fighting, two people, one Croat and one Serb policeman, were killed. Twenty other people were injured and twenty-nine Krajina Serb paramilitaries and policemen were taken prisoner by Croatian forces.[42][43] Among the prisoners was Goran Hadžić, later to become the President of the Republic of Serbian Krajina.[44]

On 2 May 1991 the Croatian parliament voted to hold a referendum on independence.[45] On 19 May 1991, on an almost 80% turnout, 93.24% voted for independence. Krajina boycotted the referendum. They held their own referendum a week earlier on 12 May 1991 in the territories they controlled and voted to remain in Yugoslavia which the Croatian government did not recognize as valid.

On 25 June 1991 the Croatian Parliament declared independence from Yugoslavia. Slovenia declared independence from Yugoslavia on the same day.[46]

The civilian population fled the areas of armed conflict en masse: generally speaking, hundreds of thousands of Croats moved away from the Bosnian and Serbian border areas, while thousands of Serbs moved towards it. In many places, masses of civilians were forced out by the Yugoslav National Army (JNA), who consisted mostly of conscripts from Serbia and Montenegro, and irregulars from Serbia, in what became known as ethnic cleansing.

The border city of Vukovar underwent a three-month siege – the Battle of Vukovar – during which most of the city was destroyed and a majority of the population was forced to flee. The city fell to the Serbian forces on 18 November 1991 and the Vukovar massacre occurred.

Subsequent UN-sponsored cease-fires followed, and the warring parties mostly entrenched. The Yugoslav People's Army retreated from Croatia into Bosnia and Herzegovina where a new cycle of tensions were escalating: the Bosnian War was to start. During 1992 and 1993, Croatia also handled an estimated 700,000 refugees from Bosnia, mainly Bosnian Muslims.

Armed conflict in Croatia remained intermittent and mostly on a small scale until 1995. In early August, Croatia embarked on Operation Storm. The Croatian attack quickly reconquered most of the territories from the Republic of Serbian Krajina authorities, leading to a mass exodus of the Serbian population. An estimated 90,000–200,000 Serbs fled shortly before,[47][48] during and after the operation.

As a result of this operation, a few months later the Bosnian war ended with the negotiation of the Dayton Agreement. A peaceful integration of the remaining Serbian-controlled territories in eastern Slavonia was completed in 1998 under UN supervision. The majority of the Serbs who fled from the former Krajina have not returned due to fears of ethnic violence, discrimination and property repossession problems, and the Croatian government has yet to achieve the conditions for full reintegration.[49] According to United Nations High Commissioner for Refugees, around 125,000 ethnic Serbs who fled the 1991–1995 conflict are registered as having returned to Croatia, of whom around 55,000 remain permanently.[50]

Croatia became a member of the Council of Europe in 1996. The years 1996 and 1997 were a period of post-war recovery and improving economic conditions. However, in 1998 and 1999 Croatia experienced an economic depression, which brought unemployment for thousands of citizens.

The new government also started several large building projects, including state-sponsored housing, more rebuilding efforts to enable refugee return, and the building of the A1 highway. The country achieved notable economic growth during these years, while the unemployment rate would continue to rise until 2001 when it finally started falling. Croatia became a World Trade Organization (WTO) member in 2000 and started the Accession of Croatia to the European Union in 2003.

In June 2009, Sanader abruptly resigned his post and named Jadranka Kosor in his place. Kosor introduced austerity measures to counter the economic crisis and launched an anti-corruption campaign aimed at public officials. In late 2009, Kosor signed an agreement with Borut Pahor, the premier of Slovenia, that allowed the EU accession to proceed.

^John Wilkes (1995). The Illyrians. Oxford, UK: Wiley-Blackwell. p. 114. ISBN978-0-631-19807-9. Retrieved 15 October 2011. ... in the early history of the colony settled in 385 BC on the island Pharos (Hvar) from the Aegean island Paros, famed for its marble. In traditional fashion they accepted the guidance of an oracle, ...

^Zrinka Pešorda Vardić: The crown, the king and the town – the relation of Dubrovnik community toward the crown and the ruler in the beginning of movement against the Court (Croatian Institute of History)